I pay zero amount for metformin, in fact all my generics with my part d insurance are zero cost

My grocery store pharmacy (Publix) offers Metformin, Lisinopril and some antibiotics free (with a prescription, of course). I get a 90 day supply of the Metformin and Lisinopril at no cost and they don’t put it through insurance so my Medicare donut hole isn’t affected. At least not by those drugs, but my others...whew, I always get in the donut hole quickly with my more expensive meds.